#!/bin/bash
apt-get update
listUpgrades=`apt list --upgradable |grep upgradable |cut -d/ -f1`
execUpgrades="DEBIAN_FRONTEND=noninteractive apt-get --yes --assume-yes -o DPkg::options::=\"--force-confdef\" -o DPkg::options::=\"--force-confold\" --only-upgrade install "$listUpgrades
eval $execUpgrades

# https://www.bggofurther.com/2018/07/automate-apt-update-and-keep-current-config-files/

DEBIAN_FRONTEND=noninteractive apt-get --yes autoremove
DEBIAN_FRONTEND=noninteractive apt-get clean